コード例 #1
0
ファイル: ASTDiagnostic.cpp プロジェクト: 5432935/crossbridge
// Returns a desugared version of the QualType, and marks ShouldAKA as true
// whenever we remove significant sugar from the type.
static QualType Desugar(ASTContext &Context, QualType QT, bool &ShouldAKA) {
  QualifierCollector QC;

  while (true) {
    const Type *Ty = QC.strip(QT);

    // Don't aka just because we saw an elaborated type...
    if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Ty)) {
      QT = ET->desugar();
      continue;
    }
    // ... or a paren type ...
    if (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
      QT = PT->desugar();
      continue;
    }
    // ...or a substituted template type parameter ...
    if (const SubstTemplateTypeParmType *ST =
          dyn_cast<SubstTemplateTypeParmType>(Ty)) {
      QT = ST->desugar();
      continue;
    }
    // ...or an attributed type...
    if (const AttributedType *AT = dyn_cast<AttributedType>(Ty)) {
      QT = AT->desugar();
      continue;
    }
    // ... or an auto type.
    if (const AutoType *AT = dyn_cast<AutoType>(Ty)) {
      if (!AT->isSugared())
        break;
      QT = AT->desugar();
      continue;
    }

    // Don't desugar template specializations. 
    if (isa<TemplateSpecializationType>(Ty))
      break;

    // Don't desugar magic Objective-C types.
    if (QualType(Ty,0) == Context.getObjCIdType() ||
        QualType(Ty,0) == Context.getObjCClassType() ||
        QualType(Ty,0) == Context.getObjCSelType() ||
        QualType(Ty,0) == Context.getObjCProtoType())
      break;

    // Don't desugar va_list.
    if (QualType(Ty,0) == Context.getBuiltinVaListType())
      break;

    // Otherwise, do a single-step desugar.
    QualType Underlying;
    bool IsSugar = false;
    switch (Ty->getTypeClass()) {
#define ABSTRACT_TYPE(Class, Base)
#define TYPE(Class, Base) \
case Type::Class: { \
const Class##Type *CTy = cast<Class##Type>(Ty); \
if (CTy->isSugared()) { \
IsSugar = true; \
Underlying = CTy->desugar(); \
} \
break; \
}
#include "clang/AST/TypeNodes.def"
    }

    // If it wasn't sugared, we're done.
    if (!IsSugar)
      break;

    // If the desugared type is a vector type, we don't want to expand
    // it, it will turn into an attribute mess. People want their "vec4".
    if (isa<VectorType>(Underlying))
      break;

    // Don't desugar through the primary typedef of an anonymous type.
    if (const TagType *UTT = Underlying->getAs<TagType>())
      if (const TypedefType *QTT = dyn_cast<TypedefType>(QT))
        if (UTT->getDecl()->getTypedefForAnonDecl() == QTT->getDecl())
          break;

    // Record that we actually looked through an opaque type here.
    ShouldAKA = true;
    QT = Underlying;
  }

  // If we have a pointer-like type, desugar the pointee as well.
  // FIXME: Handle other pointer-like types.
  if (const PointerType *Ty = QT->getAs<PointerType>()) {
    QT = Context.getPointerType(Desugar(Context, Ty->getPointeeType(),
                                        ShouldAKA));
  } else if (const LValueReferenceType *Ty = QT->getAs<LValueReferenceType>()) {
    QT = Context.getLValueReferenceType(Desugar(Context, Ty->getPointeeType(),
                                                ShouldAKA));
  } else if (const RValueReferenceType *Ty = QT->getAs<RValueReferenceType>()) {
    QT = Context.getRValueReferenceType(Desugar(Context, Ty->getPointeeType(),
                                                ShouldAKA));
  }

  return QC.apply(Context, QT);
}
コード例 #2
0
ファイル: ASTDiagnostic.cpp プロジェクト: jhoush/dist-clang
/// Determines whether we should have an a.k.a. clause when
/// pretty-printing a type.  There are three main criteria:
///
/// 1) Some types provide very minimal sugar that doesn't impede the
///    user's understanding --- for example, elaborated type
///    specifiers.  If this is all the sugar we see, we don't want an
///    a.k.a. clause.
/// 2) Some types are technically sugared but are much more familiar
///    when seen in their sugared form --- for example, va_list,
///    vector types, and the magic Objective C types.  We don't
///    want to desugar these, even if we do produce an a.k.a. clause.
/// 3) Some types may have already been desugared previously in this diagnostic.
///    if this is the case, doing another "aka" would just be clutter.
///
static bool ShouldAKA(ASTContext &Context, QualType QT,
                      const Diagnostic::ArgumentValue *PrevArgs,
                      unsigned NumPrevArgs,
                      QualType &DesugaredQT) {
  QualType InputTy = QT;
  
  bool AKA = false;
  QualifierCollector Qc;
  
  while (true) {
    const Type *Ty = Qc.strip(QT);
    
    // Don't aka just because we saw an elaborated type...
    if (isa<ElaboratedType>(Ty)) {
      QT = cast<ElaboratedType>(Ty)->desugar();
      continue;
    }
    
    // ...or a qualified name type...
    if (isa<QualifiedNameType>(Ty)) {
      QT = cast<QualifiedNameType>(Ty)->desugar();
      continue;
    }

    // ...or an injected class name...
    if (isa<InjectedClassNameType>(Ty)) {
      QT = cast<InjectedClassNameType>(Ty)->desugar();
      continue;
    }
    
    // ...or a substituted template type parameter.
    if (isa<SubstTemplateTypeParmType>(Ty)) {
      QT = cast<SubstTemplateTypeParmType>(Ty)->desugar();
      continue;
    }
    
    // Don't desugar template specializations. 
    if (isa<TemplateSpecializationType>(Ty))
      break;
    
    // Don't desugar magic Objective-C types.
    if (QualType(Ty,0) == Context.getObjCIdType() ||
        QualType(Ty,0) == Context.getObjCClassType() ||
        QualType(Ty,0) == Context.getObjCSelType() ||
        QualType(Ty,0) == Context.getObjCProtoType())
      break;
    
    // Don't desugar va_list.
    if (QualType(Ty,0) == Context.getBuiltinVaListType())
      break;
    
    // Otherwise, do a single-step desugar.
    QualType Underlying;
    bool IsSugar = false;
    switch (Ty->getTypeClass()) {
#define ABSTRACT_TYPE(Class, Base)
#define TYPE(Class, Base) \
case Type::Class: { \
const Class##Type *CTy = cast<Class##Type>(Ty); \
if (CTy->isSugared()) { \
IsSugar = true; \
Underlying = CTy->desugar(); \
} \
break; \
}
#include "clang/AST/TypeNodes.def"
    }
    
    // If it wasn't sugared, we're done.
    if (!IsSugar)
      break;
    
    // If the desugared type is a vector type, we don't want to expand
    // it, it will turn into an attribute mess. People want their "vec4".
    if (isa<VectorType>(Underlying))
      break;
    
    // Don't desugar through the primary typedef of an anonymous type.
    if (isa<TagType>(Underlying) && isa<TypedefType>(QT))
      if (cast<TagType>(Underlying)->getDecl()->getTypedefForAnonDecl() ==
          cast<TypedefType>(QT)->getDecl())
        break;
    
    // Otherwise, we're tearing through something opaque; note that
    // we'll eventually need an a.k.a. clause and keep going.
    AKA = true;
    QT = Underlying;
    continue;
  }
  
  // If we never tore through opaque sugar, don't print aka.
  if (!AKA) return false;
  
  // If we did, check to see if we already desugared this type in this
  // diagnostic.  If so, don't do it again.
  for (unsigned i = 0; i != NumPrevArgs; ++i) {
    // TODO: Handle ak_declcontext case.
    if (PrevArgs[i].first == Diagnostic::ak_qualtype) {
      void *Ptr = (void*)PrevArgs[i].second;
      QualType PrevTy(QualType::getFromOpaquePtr(Ptr));
      if (PrevTy == InputTy)
        return false;
    }
  }
  
  DesugaredQT = Qc.apply(QT);
  return true;
}